Telephone-exchange system



Feb. 22, 1927. 1,618,423

E. S. GIBSON TELEPHONE EXCHANGE SYSTEM ai Filed Nov. 21, 1924 s sheets-sh 1 /nvenfor. far/ J. Gibson by My 1,618,423 E. s. ,GLIBSON TELEPHONE EXCHANGE SYSTEM mvenfolt' far/ J. 672560!) Feb. 22 1927.

E. s.' GIBSON TELEPHONE EXCHANGE SYSTEM Original Filed NOV 21, 1924 8 Sheets-Sheet; 5

/m em0r.' 7 far/ J? 6/2650 Feb. 22, 1927.

E. s. GIBSON TELEPHONE EXCHANGE: SYSTEM Original Filed Nov. '21, 1924 8 Sheets-Sheet 4 JIIZI-fIZZQ" 1,618,423 Feb. 22,1921 a a GIBSON TELEPHONE EXCHANGE SYSTEM Original Filed NovI 21, 1924 a Sheets-Sheet hvemor: fan J? 67mm MM-W 1 Feb. '22, 1927. 1,618,423

Es. GIBSON TELEPHONE EIJKCHANGE SYSTEM Original Filed 21; 1924 8 Sheejts-Shet a 11 v M? I I hue/71w: far/ .5. Gibson Patented Feb. 22, 1927. 5

UNITED STATES PATENT OFFICE.

EARL S. GIBSONQOE RIDGEWOOD, NEVJJERSEY, ASSIG-NOR TO "WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEV] YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Application filed November 21, 1924, Serial No. 751,218. Renewed January 3, 1927.

This invention relates generally to telephone exchange systems, and more particularly to telephone systems wherein automatic switching apparatus is employed in whole or in part, for the completion of con versational connections and especially to socalled semiautomatic systems.

An object of the invention is the provision of a more eliicient method of transmitting designations from an operators position to a common receiving and registering device.

A feature of the invention relates to an impulse transmission mechanism, whereby any one of a series of digital designations may be sent from an impulse generating source to registering apparatus utilizing but one impulse period for the complete transmission of any digit. 7

Other inherent featuresand advantages of the invention will become apparent after consideration of the following descriptions and the appended claims.

Referring to the drawing, Figs. 1 to 8 inclusive, when arranged in the manner shown in Fig. 9, disclose a preferredembodiment of the invention and in suficient detail to enable a complete understanding to be attained thereof. 7

Fig. 1 shows one of a number of incoming trunks terminatingbeforean operators position, as well as one of a plurality of cord circuits by means of which the opera tor completes connections to succeeding selective switches. This figure also discloses certain controlling and supervising app-m ratus associated with the cord circuit.

Fig. 2 shows a portion of a special district selector switch by means of which the operator is enabled to extend calling lines in anv desired direction.

Fig. 3 illustrates a key setat the operators position, and upon which numerical designations of wanted lines are manually recorded. s

Fig. etin the upper left port-ion discloses one of a number of sender selector switches employed for the purpose of associating an idle register sender with the operators key set. This figure also shows impulse generating and controlling equipment for controlling the transmission of code impulses to the recording apparatus of a selected sender.

Fig. 5 shows in diagrammatic form various connective devices by means of which common controlling mechanisms of different kinds are interconnected. 'The connecting device shown in the'center of this figure is a so-called senderconnector which serves to interconnect a selected idle sender with an idle-marker such as shown within the rectangularly enclosed space. The connective devices shown in the upper portion of this figure are so-called frame and trunk connectors which serve to associate the marker with a particular district switch and with a particular group of trunks outgoing therefrom.

Fig. 6 shows the impulse recording apparatus and various controlling equipment located in the sender.

Fig. '7 discloses the several registers of the sender. The so-called office code registersare herein shown in comparative detail whi]e the numerical and stations registers are represented by the rectangularly enclosed portion.

Fig. 8 shows an .operators talking and receiving set as well as various paratus associated therewith. v

Fig. 9 is a diagram showing the manner inv which the various figures of the drawing are to be arranged to produce a unitary circuit disclosure.

General description.

-The invention as herein disclosed is particularly applicable to a telephone system of the general type disclosed in U. S. Patent No. 1,543,967, issued June 30, 1925 to S. B.

lVilliams and E. S.-Gibson. Since however,

this application is concerned mainly with the manner of generating. transmitting and recording of impulses, the operation of the various selective switches as well as the operation of the sender and the marker and the various connecting devices will be referred to in a general manner. For a more detailed description of the construc tion and mode of operation of these portions of the'eXchange apparatus, reference may be had to the patent of S. B. Williams and E. S. Gibson above referred to.

The special districtswitch 200 as well as the sender selector switch e300 may be preferably of the coordinate type such as shown and described in the BritishPatent 183A38 issued to the Vvestern Electric Company, Limited, accepted September 6,

The method of generating and transmitpieces of apvention. an idle cord circuit into the push in both operating and releasing.

ting impulses herein described is shown in connection with a so-called special operators equipment. lVhen a subscriber dials the digit zero or when an operators services are required for the completion ot a connection, for example. a toll or long distance connection, a trunk is seized leading: to the special ope'atorg position. l l pon the seizure of such a trunk, a visual signal given to the operator that a call requires her inter- She thereupon inserts the plug oi": riated with the calling; signal and learns the wants of the calling;- subscriber. Under certain circumstances it may he that the calling subscriber is situated within the same exchange as the special operator and has dialed the digit zero with the intention of securing the aid of an operator in completingr a coin'ieetion. tinder other couditions the calling signal may be actuated hy the extension of a connection iron; :1 socalled long distance or from a toll point,

Having learned the designation of the wanted line, the special operator proceeds to set up the same manually on the he) Set: shown in Fig. 3.

As soon as the operator inserts the plug; 150 in jack 151 the sender selector switch tOO is actuated to associate an idle register sender, such as shown in Figs. 6 and 7 with the operator s key set. At this time also the impulse generating and controlling equipmentshown in Fig. 4; is brought into operation. clays 401, 102, etc, by successive cycles of operation and release, control the association of each row of keys 2:301. 302, etc, in the proper sequence with the record ing relays of the sender. The timing of each impulse is controlled by relays 406 and 407 which are designed to be relatively slow Since but one impulse period required for the transmission of each digit, it becomes necessary to provide Incans Wherehy the digits to 9 may be recorded. This is taken care oi h means of the recording relays (till, (50:2, 303, etc.,in the sender. It will be observed that these impulse recording; relays occur in pairs. The relays ($01.. 603 and (305 of each pair are designed not to operate when the resistance 310 "which is relatively hip h is included in series with their windings Whereas, relays 602, (50% and 06 are desifrncd to operate both when the resistance 310 is connected in series with their respc ttive windings or when these windings are rounected directly to ground. When a particular row of keys as row 302 has been associated with the recording relays by means of a relay similar to relay eljll and the recording TU lays have been operated corresponding; to the setting by the operator, the correspond iug connecting); relay as 70.1 in the sender register circuit is operated. clays T01, T02, etc connect the contacts oi" the record inn relays with the relays of the several tiers 710, 720, etc, and the proper irltt relays are operated. For etarnple, il. he}! PM? is drpresstul, then when the inipulse recording relays are associated with row 302 by means ot relays 40:3 and 412, re lays 02 and ooo are operated. Relay G06 brings about: the operation of relay 701 and a circuit is 'hcreupou closed tor the operation of lt ilfmiltl' relay 705. As soon as the resistor Tltl is positioned,relay 721 open ates and transfers the recording leads to the succeeding register 720. At the end ot the first impulse period. as determincnl by the successive operation and releare ol'" relays ltlti and till. the recording relays Which had een operated are now released and rendered as ociable with a succeedin o row ot lzeys. lows S0 3. 304 ad 305 and row 306 which correspond to the innnerieal designation are next: associated n suece;-51.'on with the recording relays. which are in turn ass-ociatcd in sequence with the respective registers T20, T30. etc. While in practice there will he provided it) l(C "S in each row, :tor the purpose o't securing simplicity in the drawing: but live li'eys are illustrated in each run. In a. siniilar inanner only the route register 71.0 and the olliec code re rist "Q0. and 7130 and T are shown in detail, it being! understood that the thousands, hundreds. tens, units and stations regis ere: represented diauraininatically by the reetangzuh'nly enclosed portion 750 inchale regime: relays similar to relays T05, Tutti etc. i

hen the route register T10 and the ollice code registers 7:20, TE-l0 and 7140 have been positioned. the tfOlillGfitllijJ device 500 is selectively actuated to associate the sender with an idle outgoing marher or switch controlling imchanisui as 580. The record on rcgi.-:ters T10 720, etc, is now tnuis'tcrrecl to cox-res iouding registers 510, 520, etc, in the marker. At this time also the frame eon-- nector 550 and the trunk connector 560 are operated. Connector 550 associates the marker te t ng mechanism 570with the particular district; switch 200 wherein the cord 12) terminates, and the trunk connector 560 associates the same testing: mechanism with :1 partieula r group of trunks outgoing; trou'l switch 200 leading in the desired direction. a. marker having detcrlnined'an idle link, ',ri\ u;; access to an idle trunk, in the selected roup. the proper l'iorizzontal magnet as 2U] is oprratcd and the cord tilt) is ronnecttal to an outgoing trunk leading; in. the direction of the railed olliee. The purpose of the row oi routing licys 301 which position the regieters T10 and 510 in sequence. will now he apparent. Should the called line be located till v illiams and E.

in an office which is accessible by means of a plu 'ality of alternate routes through different tandem oflices, thenthe operator by means of the row of keys 301, may determine which tandem ofiice shall be employed in the completion of the connection, as described in detail in the copending application of S. B. S. Gibson, Serial No. 751,235, filed Nov. 21, 1924.

Detailed description.

' idle cord circuit as 120 in the jack in which til the trunk 152 terminates. The insertion of plug 150 in jack 151 causes relay 101 to operate in a circuit which may be'traced from battery through the winding of said relay to the sleeve of plug 150, thence to the grounded sleeve conductor of trunk 152. Relay 101 in operating completes a circuit from ground at the armature and back contact of relay 102, outer contacts of relay 101, right inner contact of relay 103, windin of relays 104- and 105, left contacts of re lay 111, through resistance 801 to battery. Relays 10 1 and 105 operate in this circuit and immediately close a locking circuit which is completed from the above traced battery through the windings of these relays in series, through the locking contact of relay 1 01 and thence to round through the winding of relay 102. llelay 102 while included in this locking circuit does not operate however, since its winding is shunted by the previously traced ground for operating relays 104: and 105. Relay 105 at its right armature and front contact connects ground through the windings of relays 103, 107 and 106 in parallel. Relay 103 immediately closes a locking circuit through its left windand locking contact, left armature and ba k contact of relay 1.12 to the groundec. conductor 155. The operation of relay 103 removes the shunt from around the winding of relay 102 which now operates in series with relays 104 and 105. When relay 106 operated, the 'operators talking set was connected through contacts of the said relay to the incoming trunk 152. At this stage of the connection the green lamp 108 is illuminated in a. circuit completed from battery through the said lamp, left armature and back contact of relay 113, outermost contacts of re lay 11 1, middle contacts of relay 115 to the grounded conductor 155. The green lamp remains lighted in this circuit until the connection is disrupted.

vVhen relay'101 first operated it completed a circuit for the start relay 431, traceable from battery through the winding of said relay, conductor 1541, upper inner contacts of relays 109 and 116, outer contacts of relay 117 to the grounded conductor 155. In the manner described in detail in the above mentioned patent to S. B. lVilliams, No. 1,517,- 331, relay brings about the selective operation of switch 400 whereby an idle sender which it may be assumed is the one shown in Figs. 6 and 7 is associated with the operators key set; lVhen magnet 432 energizes during the selective operationof switch 400,

temporary holding ground is applied to conductor 151. This ground also causes the operation of frame testconnecting relay 607 in a circuit traceable from battery through the winding of said relay, contacts of relays 608, 609 and 610. to the grounded conductor 451. Relay 607 causes the operation of frame test relay 608 in a circuit traceable from battery 1 through the winding of relay 608, left contacts of relay 607, conductor 452 to ground at the armature of magnet 132. Relay 608 opens the above traced circuitof relay 607, but this relay bemg slow to release mamtains its 'armatur'es attracted for an appreciable interval, during which the llOlding relay 611 operates in a circuit traceable from battery through its winding, locking contact of relay 608, left contacts of relay 607, to ground as above traced. Relay 611 locks to ground at the sender release relay 610.

Relay 109 is operated at" this time in a circuit which maybe traced from battery through the winding of said relay, right contacts of relay 113, through contacts of switch 41:00 to conductor left contacts of relay 610, winding of relay 612, tog-round at the armature of relay 611. Relay 109 in operating opensthe original circuit of the start relay 131 and this relay releases. However, the connection is .held through switch by means of the continued energization of a horizontal magnet such as 4 08 The white supervisory lamp is now lighted i a circuit completed from battery, through said lamp, lowermost contacts of relay 109, to ground at the outermost contacts of relay 115. lighted until the connection to the called line is established.

The sender recording circuit'is now associated with the operators keysetby means of the group of conductors 153. It will be assun'ied that the called line designation necessitates the depression of route key 311 and office code keys 305, 312 and 313 respectively. It will be further assumed that the l ne designation contain no stations digit. The operator therefore depresses a key in The lamps 110 and 108 remain each oil. the numerical rowu ulart her 2101*. soon as lHOHHr; the Wiart her i lilt (full is completed fl iftllil t wiuiliu u oi tart relay W. conductor 4.51% rloeeil ronlariu till) to gflmlilli. it will he ililltll lhut ruuiach: iii?? are rloiaal \rluine'wr all) her in row ltli' is ilei:rrsert l. liela) 7 i ii at its inner aruialure rennet-ta ground to conductor lo l them-e through the innermost rontiu'lu oi rrlay 105. through the norural rrontucti; aiul whirling; oi relajr lib to hab tery. :lielar Jill operates null immediately (hit-0H a locking); rireuil: tor itueli' to i'hc grounelrll \"t iltillt'ifii' E55. eounerlu grounil throiul'h 300, followed by the one utor tit)" thurel'orm a cirier through the he v lie ujr 13.0%) alrm iiiouter cmitaes thence ,hrouuh {he left inner ri'uu'acti-z ell re ays it {Hit lift. lel t contacts oi? relay l" imreruioat urnuatlu'e :nul lurch com-net of relay illil. to hutiicry through lhe winzlingr oil? relur Alli. lleiar ll. ionuerliatelr clears a locking: circuit vhirh iua: he trarml :troui hutterr throruajh its Willliii :uui locking our ot reiar rectal lieluv alien) contact. reiuluetor i122, lo ground as preriou: el-2:2 (lee? not operate in i rcuit ninre ii-7 winding is Hlilllll'lil hr ti rirruil' l' r opeutinfe; relur lll. li th the relay ill. operated the initiation of tlu' iur h-e timing: r1- lays -il0li aiul ell)? is hce'uu. The manner in which these releyu nut-lien is us tulluuu: Relay 406 uuou euer rirsiu r (fl HCul an liner: ting circuit for relay all)? which i u to Ol'ltlili'k requires an ap ueciahle intervul for the attraction oi its uruiui'urza-i. li'hrn it hue completely attruelezl its urm: lure. relur ll)? connects a shunt around the Winding! tit relay 4-06 which ll ereuoou releueeu and :u' the eiul oi a Short interval relay 4th} mums the releaee oi relay 407. Thiu errle of onerution anti releaae o'i reluru illi; null ltli' serves to time the, trunsuniueie'u o'l rurh inipulse from the operators he srt to the rcortliue' relays of the Sender. Jircortiiugir rhen relay lli operates a circuit is co1u pie-tell from battery through the winding a? relay th right outside of relay 4.01 normal contacts of relay lillun ier armature :uui hurl: contort oi" relay -itii. lel t outer rozi tuctr of relay llL to gyrounrl at the urinal ure oil? relay ililil. When relay lilo hue emuulei'rutlrartetl its arunitlureia a circuit 1 5 com iileleil 'lroin buttery through the u'iiuliiujr e't' relay 101'. right outer :iruniturcii aiul, trout routurl' oi reluy 1-06, to gggrouiuji, at an :ruia- Relay -lOi' upon a tract- E inc; Flo

ture oi rela all), iugr its: urinatureu shunts the winding oi rehir {llili h means of ground Whirh is runnerell lhroue'h contacts oi? rela vu 509 anti ei-lli to the lower teruiinul of the \rit-ulinzr oi relur illi}. llelar lilo cuu'nnenres to release and when it ias riunpletelr relrartml its. an .i'uuturee ehunts the euerglirtin ir cir =uit1 oi relav -Lllii' which n turn he r. to relruee. Thin cycle cl operation and release oi ihe timing: i'tl%l \ri iurepeatccl tor each digit; transunitteil. Upon lhe o mratiion of relay hi7 a circuit is mnuiletenl :troni buttery, through the winding: of relay ill le'lt outer rouuurtu of relay' it)? to ground at the :1 ruuiture U11": relay ltll). leluy 42]. also closes u lot-nine circuit which lo completed through lhe le'lt (:oniuets of relay 4-06 to the same ;,t rouiu h lielu r elll in operating connects iuutery through its; right coutuclja, thence ihroiurh the upper "\rirulingi oi relay eLO'I, lhruugi'h he left oui'er rouizuctu of relay 411 to gi rouinl at the urn'iaturc ell relar .23. Relar ill inunetliatelr loclir'? throngs: its lower winding null inching ron u'l; to the same in: ii 'l 'he opera tion ol relay ellli at this ac openiihe or ginal euei'izjizineg circuit of all l or 4225 ru above (lescrihctl, and the reniorml l'ruln tl latter relay. run some nor. operute n Route he Bil having been depressed, an inapulue circuit is; rouinletetl From battery through the wirulinns; oi relays (504- mill ($03, conductor 45?) tln'ougrh contocts of switch 4&00, contacts ol rein 105 ccniluclim' 156, right middle contacts; oi relr 4:11, cmuluctcr 41.57, le'lt. contacts oi her 3 l1, high resistance 310 to ground. Since the l'QHlS'iillCll (it this ciruit muuiaratire]; high, the marginal relo}; till (lore not operatitu hut relay (301': (lees opeattc. Another inuiulee circuit is 001m pleted at this time which may be traced from buttery through the winrlin e of relays (S06 null 605, right, coutaetu of relay (315, conductor Uri. contacts o'l? switch lull, oi'rternioezt contauts of relay um. roiuluctor 157 right; outer arn'iature and front (:ontuet o'lf reloy ill, conductor 458, right contacts of key 311, reuiutancc flit) to grountl. Since the high resistance 310 is connected in series with the winding; of marginal relay (SUB, this latter relay clues not operate. However, relay 606 (lees operate in the ahore traced circuit. l r'ith relay cue ope atetl, ground is connected through the outer eonta of the Silltl relay, eontacts oi? relay (H3. ruzht armature and back Contact 0t relay 72L, winding; of relay T0]. to battery. llrlur T01 rounects the route register reloys Tilt) to contacts oi the recorillug relays in Fig. (5. Since relzrrs (Elli; and (106 alone are eper: tell. register relay T06 is energriaccl. The eirruit for operation relay 706 may he recoil t'riuu llilli'tlf) through the winding: of the some, coutuctu of? relay T01 conductor 75'], le'tl; contacts o'l? relay (30:1 lctt armature and. :lrout contact oi? relay (10 i, ormature and hack contact o't relay 1303- to ground at the armature of relay (3%. .lelay 706 in operating); closes a locking circuit, for itsel't to the 'rounrle l conductor will.

ll; will he notetl thut when relax T01, operaterl a locking circuit; roe completed for the came which may he t 'accrl from battery through the winding and locking Contact of which new reuiains loritetl in series relay 701, conductor 752, winding of relay 613 to ground at the armature of relay 606. While relay 613 is included in this circuit the same does not operate since it is shunted by the previously traced operating circuit of relay 701. However, when relay 706 is operated as a result ot'the transmission of the first impulse, a circuit is completed from battery through the winding of relay 721 thence through outer contacts of relay 706 to the grounded conductor 456. Relay 721 immediately looks through its winding and locking contact to the conductor 456, and at its right arn'i'ature and back contact removes the shunt from around the winding of relay 613 and this relay now operates in series with relay 701. At the end of the first impulse period, relays 406 and 407 become released. With relays 406 and 407 normal, the

previously traced locking circuit of relay 411 is opened and this latter relay now releases. Relay 411 in releasing disconnects the recording relays from the key set, and relays 604 and 606 which had been operated thereupon release. The release of relay 606 disconnects the holding ground from the windings of relays 613 and 701 which relays now release. The release of the timing relays 406 and 407 also opens the locking circuit of relay 421 which, after a short interval, retracts its armatures. Relay 421 is designed to be slow releasing to permit disassociation of the recording relays 601, 602, etc., from one row of keys, before these relays are as sociated with a succeeding row of keys.

The first digit having been transmit-ted, the timing relays 406 and 407 initiate a second cycle of operation and release. At this time, however, relay 412 operates to associate the recording relays with the row of keys 302. The circuit for operating relay 412 may be traced from battery through the winding of the same, lowermost armature and back contact of relay 402, lowermost armature and front contact of relay. 401, contacts of relay 422, inner armature and back contact of relays 421 and 407 to ground at the armature of relay 409. Relay-412 locks in a circuit traceable from battery, through the winding and locking contact of relay 412, conductor 455, winding of relay 422 to the above traced ground. As hereinbefore described, however, relay 422 is at this time shunted and does not operate. Relay 406 now operates in a circuit traced from battery through its winding,right contactsof relay 407, normal contacts of relay 421, upper armature and front contact.

of relay 401, upper armature and back contact of relay 402 through theleft armature and front contact of relay 41.2 to groundat the armature of relay 423. Relay 406 in turn causes the operation of'relay 407 which upon operating shunts relay 406 and this latter relay releases subsequent to which,

the'iinpulse recording relays. Since key 305 is assumed to have been depressed, an impulse circuit is completed from ground through resistance .310, right contacts of key 305,, conductor 459, right outer armature and front contact of relay 412, conductor 157, outermost contacts of relays 105, contacts of switch 400, conductor 454, contacts of relay6l5, to battery through the windings of relays 605 and 606. Relay 606 alone operates in this circuit because of the inclu-- sion therein of high resistance 310. Another in'ipulse circuit is also completed from ground through resistance 310, left contacts of key 305, conductor 351, right inner contacts of relay 412, conductor 158, contacts of relay 105, contacts of switch 400, conductor 461, winding of relays 601 and 602 to battery. Relay 602 alone operates in this circuit, because of the resistance 310 included in series with relay 601. As soon as relay 606 operates ground is connected through an armature and front contact of relay 606,

thence through contacts of relay 613, right armature and front contact of relay 721, right armature and back contact of relay 727 to battery through the winding of relay 7 02.. In the manner already described, relay 702 completes a locking circuit for itseli which includes the winding of relay 613, and as previously described,relay 613' does not operate since its winding is shunted. lVith recording relay 602 operated a circuit is completed from battery through the winding of register relay 725, contacts of relay 702, conductor 753, right armature and front contact of relay 602, armature and back contact of relays 604 and 603 to ground at the, armature of relay 606. As hereinbefore described in detail, relay 725 locks to second impulse period'relays 406, 407 and 421 are released thus bringing about the release of relay 412 and the consequent disconnection of the recording relays from the key set.

hen relay 421 retracts its armaturesr'a circuit is completed for operating relay 413.

This circuit is similar to that already described for relays 411 and 412. Relay 412 also locks in series with relay 4-22 which however being shunted fails to operate at this time. Upon operation of relay 413, in a manner deemed to be already familiar. a

circuit is closed for relay s06 which initiates l ll to ground. Vi 'ith relay the third impulse period. Relays 406 4-07 therefore undergo a third cycle of operation and release during which period i1npulses corresponding to the second digit of the otlice code are transmitted. Since hey 312 is depressed an impulse circuit is completed from battery through the windings o'l relays c041 and 003, conductor 453, through contacts ol switch e00 and relay to conductor like, thence through the right middle contacts of relay all left contacts 01? key 3M to ground. Another i111- pulse circuit is completed and may be traced from battery through the windings of relays 000 and UU-l thence through contacts of switch e00 and relay 105 through the right contacts of key Site, resistance 310 to ground. Since the resistance included in the lirst traced circuit: is comparatively low both relays ($03 and tall are energized, whereas the high resistance 3L0 being included in the latter circuit relay 000 alone is energized. la the manner thought to be now :liarniliar. the operation o't relay (506 causes the actuation of connecting relay 703 and register relay "i operates in a circuit from battery through its winding, contact of relay 703. armature and trout contact of relay 002}. to ground at relay 006. The operation oi? relay Till as already described causes the operation of relay 731, relay 731 in turn opening the shunt around the winding of relay ($13 which. operates in series with 702- At the termination oi? the third impulse period when relay all?) and the recording relays release, the locking circuit of relays 703 and 613 latter relays release.

In a similar manner the registers Tall) and broken and these 750 are associated in so on by means of relays similar to rela ,l and -Ll-ll with correspolnling rows .in the key not whereby the complete line designation is recorded upon these registers. .l hen all the digits of the line designation hare thus been t ansmitted a circuit is completed for relay 423 which may be traced from battery through the winding ihereott. lower outer armatnres and trout contacts cl relays ltlll. i052, elti-l. etc, in seri thence to ground by way of coinluctor 402 as hereinbetorc described. Relay I immediately closea inching circult which is completed through its locking contact. thence through the rightouter ar- 'niatures and back contacts or relays ill, 4122,4135 in parallel, etc... through. the right contacts ot the depressed lteys in corresponding rows and thence th ough resistance 310 i123 operated ground is connected through the right armature and 'l'rout; contact of the saute, to conductor 463 thence in parallel through the windings ot the hey release magnets shown at the top of llig. 3 to battery. 'lhe operation at these magnets causes the release ol the depressed lqeys. Then all the keys have been thus released, the above traced locking circuit for relay 4-23 is broken and this relay releases.

it will be noted that when relay i223 operated, the holding ground for relays 40.1, 4012, etc. was removed and these relays released. it will also be noted that when contacts 5300" opened as a. result ot the restorw tion of key 3506, relay 4105) released. release oi relay loll, disconnects at the outer arrnaturev thereof, the ground :lor operating the throng relays :l-Utl and $.07, thus preventing turther operation of these relays. 'llhns the lieysct shown in Fig. :15 and the control mechanism shown in Fig. l is entirely restored to normal.

ll'hen the oll'ice code register 7-l0 has been positioned as described in detail hereinbetore a circuit is completed from the ground ed conductor inc. leitt contacts of relay 728, left: outer armature and back contact of relay till right contacts of relay (iii, to conductor loll Ground on conductor e257 SBl'VBb' to bring about the actuation oi? the sender connector 500. ll ith the sender connector operated, the sender is associated with an idle niarlcer as 580. The record is now transferred from registers T10, 720, 730 and T-ll) to corresponding registers 510, 520, 530

and 54-0. ll or a description oi. the manner in which connector 500 selectively actuated. and for a description of how records are transferred from the sender to the marker reference may be had to the patent to ll arrcn ll. Carpenter, No. 1,600,399, issued slept. :21, 1920.

In the manner described in detail in the U. ll atent lilo. lditltl l lll, issued September Ell, 19526 to l3. ll illianis, :l'ranie connector actuated to operatively associate the switch 200, .in which the cord 120 terminates, with the test mechanism 507. A test thereupon inade oi the horizontal links in switch. 200, such aslinlzs 2155 are, etc, for the purpose T determining an idle one thereof. At this time also the trunk connector 560 is operated to associate the test niecl'ianisni 5370 with a particular group oi trunks leading in the desired direction.

Having determined an idle linlr in switch 200 giving access to a trunk in the selected group a vertical magnet Edit; and a horizontal magnet as ll 0 are energized and the cord is connected with this idle trunk. For a detailed. description ol' the manner in which the switch 200 is operated to coin The lit)

plete connection ot an operators cord cirofthe manner of releasing the connection after termination of conversation reference may be had to the copendmg application of S. B. lVilliams and E. S. Gibson, Serial Nd 'simultaneouslyto selectively actuate said mechanism, and means responsive to and in accordance with the actuation of said mechanism for positioning the register with which said mechanism is associated.

2. In a telephone system, an operators position, a keyboard thereat, a controlling sender comprising a' plurality of registers and an impulse recording mechanism, means for associating said mechanism in succes' sion with each of said registers, means for sending simultaneously from said keyboard to said mechanism a plurality of impulses of variable character to selectively actuate said mechanism, and means responsive to and in accordance with the actuation of said mechanism for positioning the register with which the said mechanism is associated.

3. In a telephone system, an operators position, a keyboard thereat, a controlling sender comprising a plurality of registers.

and an impulse recording mechanism consisting entirely of relays, said mechanism being adapted for association in succession with each of said registers, means for sending from said keyboard to said mechanism a plurality of impulses simultaneously, to selectively actuate said mechanism, and means responsive to and in accordance with the actuation of said mechanism for positioning the register with which said mechanism is associated.

I 4. In a telephone system, a keyboard comprising rows of keys,a controlling sender comprising a plurality of registers and an impulse recording mechanism consisting of sets of relays, means for associating said mechanism with the registers of said sender in succession, means dependent upon the actuation of a key in any row for sending an impulse to each of said sets of relays simultaneously to selectively actuate the same, and means dependent upon and in accordance with the actuation of said sets of relays for positioning the registers with which said mechanism is associated.

In a telephone system, an operators keysct comprising rows of keys, a plurality of controlling senders, each sender comprising a plurality of registers and an impulse recording device, a sender selector switch,

means for operating said sender selector switch to associate an idle sender with said key set, means "for associating each of said rows of keys in succession with said recording device, means for associating in succes sion each of the registers of a selected sender with said recording device, means res )onsive to the actuation of any key in an row for sending simultaneously a plurality o'fcode impulsesqto selectively actuate said recording device, a timing device for controlling the period of transmission of said plurality of impulses and for controlling the time of association of any of said rows or" k ys with said recording device, and means'responsive to and in accordance withthe selective actuation of said recording device 'for position ing the register with which said recording device is associated.

6. In a telephone system, an operators keyset comprising rows of keys each row bearing a difierent group designation, a plurality of cord circuits, a register sender, a sender selector switch, means responsive to the operators seizing an idle cord circuit for use for causing said selector switch to operate to associate an idle sender with said keyset, an impulse recording mechanism in said sender, means for associating said mechanism in succession with each of said rows of keys and with a corresponding one of the registers in said sender, means for sending from said keyboard dependent upon the setting thereof a plurality of impulses simultaneously to said mechanism to selectively actuate the same, and means responsive to and in accordance with the actuation of said mechanism for positioning the register with which said mechanism is associated.

7. In a telephone system, an operators of impulses simultaneously to said mecha nism to selectively actuate the same, and means responsive to and in accordance with the actuation of said mechanism for positioning the register with which said mechanism is associated.

8. In a telephone system, an operators keyset consisting of rows of keys, a plurality of controlling senders each associable I with said keyset and each comprising a plurality of registers and an impulse recording mechanism, an impulse tlmmg device comprising a pair of relays arranged to cycli- ,cally operate and release, means efiective durin a CCllCiLlOJBTatlOll and release of said pair of relays for sending simultancous- 1y a pluraliijf of impulses from said izeyset to selectively actuate said recording niech anism, means lfor associating the lQgiHtOlS of said sender in succession with said recording mechanism, and means responsive lo and in accordance with the selective actuation of said mechanism for positioning the register with which said mechanism is associated.

9. In a telephone system a controlling device, a sender comprising a plurality of registcrs and an impulse receivillg mechanism, said ineehaniisni being adapted to he asso ciated in succession with each of said registers, means for simultaneously sending from said controlling device to said mechanism a plurality of impulses to selectively actuate said mechanism, and means responsive to and in accordance with the actuation 0:1? said mechanism for positioning the register with which said mechanism is asso elated.

10. In a telephone system, a primary regisi'ering device, a controlling sender compria ing a plurality of saazondar i registers and an impulse ICCOlTllIlg incchanzsnn said mechanism being adapted to he associaiid in sue cession with each of said reg s'lers, means for mechanism, and means responsive to and in i accordance with the actuation oi said. niechanisui for positioning The secondary register "with WlllCll said nicchanisni is associated.

ln Witness whereof, I. hereunto subscribe my name this llth day of November A. 1).,

EARL S. GIBSON. 

